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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47802] Destroy opCtx after responding to clients</title>
                <link>https://jira.mongodb.org/browse/SERVER-47802</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Destroying &lt;tt&gt;OperationContex&lt;/tt&gt; before responding to a client (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/eae31861e0f813f0099e1d490c4a622d75cd5a08/src/mongo/transport/service_state_machine.cpp#L479&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;see here&lt;/a&gt;)&#160;makes the cost of reclaiming resources visible to the client, and negatively impacts the performance. We should investigate the possibility of postponing the destruction until after the response has been sent to the client.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1330148">SERVER-47802</key>
            <summary>Destroy opCtx after responding to clients</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
                    </labels>
                <created>Mon, 27 Apr 2020 17:40:47 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:59 +0000</updated>
                            <resolved>Thu, 14 May 2020 14:37:53 +0000</resolved>
                                                    <fixVersion>4.4.0-rc7</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3090494" author="ben.caimano" created="Fri, 15 May 2020 19:03:06 +0000"  >&lt;p&gt;Yep, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=amirsaman.memaripour&quot; class=&quot;user-hover&quot; rel=&quot;amirsaman.memaripour&quot;&gt;amirsaman.memaripour&lt;/a&gt; has expressed the changes accurately. Thanks for responding so quickly!&lt;/p&gt;</comment>
                            <comment id="3090060" author="amirsaman.memaripour" created="Fri, 15 May 2020 16:03:14 +0000"  >&lt;p&gt;Sure, this ticket was a quick performance improvement for those who don&apos;t use pipelining. We&apos;ll hopefully address batching/pipelining in future efforts. Thanks for pointing this out &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.broadstone&quot; class=&quot;user-hover&quot; rel=&quot;matt.broadstone&quot;&gt;matt.broadstone&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="3089993" author="matt.broadstone" created="Fri, 15 May 2020 15:40:58 +0000"  >&lt;p&gt;Thanks for the quick reply Sam. I also just wanted to get it on your radar that there are a &lt;em&gt;lot&lt;/em&gt; of users out there that depend on pipelining (for better or worse), so it&apos;s probably worth considering them in the future to some degree. We&apos;re working hard to migrate them away from it, but can&apos;t really force people to upgrade if they don&apos;t want to. &lt;/p&gt;</comment>
                            <comment id="3089930" author="amirsaman.memaripour" created="Fri, 15 May 2020 15:17:31 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.broadstone&quot; class=&quot;user-hover&quot; rel=&quot;matt.broadstone&quot;&gt;matt.broadstone&lt;/a&gt;&#160;I don&apos;t think the changes would have any negative impact, even in presence of pipelining (batching). This patch only moves the cost of deleing opCtx around, and without batching, we can utilize the gap between requests to do the destruction work. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ben.caimano&quot; class=&quot;user-hover&quot; rel=&quot;ben.caimano&quot;&gt;ben.caimano&lt;/a&gt;, please correct me if I&apos;m missing something here.&lt;/p&gt;</comment>
                            <comment id="3089880" author="matt.broadstone" created="Fri, 15 May 2020 14:55:59 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ben.caimano&quot; class=&quot;user-hover&quot; rel=&quot;ben.caimano&quot;&gt;ben.caimano&lt;/a&gt; the node driver does still pipeline, and will continue to default to doing so until we can change the default in the upcoming breaking 4.x release. I haven&apos;t followed this very closely, but did we make changes here that would negatively impact those users? &lt;/p&gt;</comment>
                            <comment id="3087885" author="xgen-internal-githook" created="Thu, 14 May 2020 19:15:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47802&quot; title=&quot;Destroy opCtx after responding to clients&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47802&quot;&gt;&lt;del&gt;SERVER-47802&lt;/del&gt;&lt;/a&gt; Destroy opCtx after responding to clients&lt;/p&gt;

&lt;p&gt;Postpone destruction of opCtx until after responding to clients to&lt;br/&gt;
reduce the cost of destroying opCtx on the critical execution path.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit b77252a641838f43e3c09796a09be22ab8f44e1c)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/91cebe1fe7661260615ec524e17ccfdc2df10387&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/91cebe1fe7661260615ec524e17ccfdc2df10387&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3085972" author="xgen-internal-githook" created="Thu, 14 May 2020 14:37:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47802&quot; title=&quot;Destroy opCtx after responding to clients&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47802&quot;&gt;&lt;del&gt;SERVER-47802&lt;/del&gt;&lt;/a&gt; Destroy opCtx after responding to clients&lt;/p&gt;

&lt;p&gt;Postpone destruction of opCtx until after responding to clients to&lt;br/&gt;
reduce the cost of destroying opCtx on the critical execution path.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b77252a641838f43e3c09796a09be22ab8f44e1c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b77252a641838f43e3c09796a09be22ab8f44e1c&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1356094">SERVER-48295</issuekey>
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